Impact crusher



Dec. 24, 1940. E. a. SYMONS IMPACT CRUSHER 2 Sheets-Sheet 1 Filed Oct. 14, 1938 Dec. 24, 1940. I 5 B sy d s 2,226,330

IMPACT cnusmm Filed Oct. 14, 1938 2 Sheets-Sheet 2 fzeyezwar [@0215 A fy/raozas' Patented Dec. 24, 1940- UNITED STATES IMPACT causmm Edgar B. Symons, Hollywood, Calif., assignor to Nordberg Manufacturing Company, Milwaukee, .Wis., a corporation of Wisconsin Application October 14, 1938, Serial No. 234,944

.1 Claim. (Cl. 83-46) My invention relates to an improvement in impact crushers and has for one purpose the provi-' sion of means for projecting or delivering material tobe crushed into the path of movement of the impact members of a rotor.

Another purpose is the provision of conveying means whereby the speed of delivery of the particles into the crushing zone may be accurately controlled.

Another purpose is the provision of improved crushing means wherein particles crushed by the impact of a rotor are centrifugally directed for glancing blows against a pile of already crushed or partially crushed material.

Other purposes will appear from time to time in the course of the specification and claim.

I illustrate my invention more or less diagrammatically in the accompanying drawings wherein:

Figure l is a vertical section taken transversely of the axis of rotation of a rotor; and

Figure 2 is a similar view through a variant form of the device.

Like parts are indicated by like characters throughout the specification and drawings.

Referring first to Fig. -l I generally indicates any suitable foundation upon which is mounted a housing which includes walls 2, 3, a top member 4, and material supporting shelves 5, 6 extending in staggered relation from the walls 2 and 3. I generally indicates the shaft of a rotor member having a hub 8 with outwardly extending vanes 9 upon which any suitable impact members or plates ill may be mounted. Any suitable means may be employed for imparting the desired speed of rdtation to the shaft 1, the details of which form no part of the present invention and are not indicated herein. The housing is apertured. as at H to permit an entry port through which the particles to be crushed may be directed.

In order to direct the said particles to the crushing zone, I employ a high speed conveyor. I illustrate, for example, a drive shaft l2 in which is any suitable pulley or drum l3. I4 is an idler shaft carrying a pulley l5. I6 is a flexible belt structure passing about the pulleys l3 and l and provided with any suitable flights or conveying members ll. I8 is any suitable surrounding housing. I9 is a down spout adapted to deliver material to one end of the belt I6. 20 is any suitable drive pulley or the like which may be connected to any suitable source of power whereby the conveyor i6 is driven at high speed and the particles fed down the chute i9, are thrown through the aperture ll into the path of movement of theimpact plates i0.

' precise showing.

As will be clear from the figure, the particles are centrifugally directed downwardly against a mass of material 2| gathering upon the shelf 5. The parts are so proportioned and located that the centrifugally delivered particles strike the mass 5 2i at an angle-providing a glancing blow. There is an additional impact or reducing effect of particle against particle and while the shelf 5 maintains a constant mass of material as at 2|, the excess material is constantly flowing over the outer lip of the shelf 5 and delivered upon another mass of material 22 upon the shelf 6, and thence passes downwardly through any suitable spout or delivery zone 23. Some of the particles may miss the. pile 2| altogether and strike the pile 22, but in. either event there is an impacting or reducing eil'ect resulting from the centrifugal direction of the crushed particles against the mass of particles at rest.

I find in practice that a rotation of the pulley 50 It at the rate of 1500 R. P. M. causes a sufficient acceleration of the particles to get them well into the path of movement of the crushing platesor impact members l0, whereby "a highly emcient crushing takes place.

Referring to Figure 2, I illustrate a variantform of the device in which the conveyor Ilia is downwardly inclined, whereas it is shown as practically horizontal or even' slightly upwardly inclined in Figure 1.- It may be practical to deliver the ma- I0 terial directly to the upper end of the conveyor Ilia but under some circumstances it is desirable to have an additional feeding conveyor 3!, which receives the material from the down spout Ma and delivers it at relatively high speed to the upper end of the conveyor Ilia, the'flights' Ha of which then fling the material into the path of movement of the plates Illa. If desired, the end of the conveyor 16a may be protected by a shield 30.

, In the form'of'Figure 2,- I illustrate but a single 40 shelf 5a which holds the mass of material 2la.'

It will be realized that whereas I have described and illustrated a practical and operative device, nevertheless many changes may be-made 5 in the size, shape, number and disposition of parts without departing from the spirit of .my invention.

I therefore wish my description and drawings to. c

be takenas in a broad sense illustrative and dia-' grammatic, rather than as limiting me to my ,The'use and operation of my inventicnfare as follows:

' Iprovide a rotor including the impact members I ill, rotated at high speed byany suitable means not herein shown, I employ a belt IS, with flights 68 IT, to project the particles to be crushed into the path of movement of the members It). The high speed conveyor may be driven at speeds as high as 1500 R. P. M., with reference for example to the shaft l2 and the pulley I3 carried thereby. The result is a very rapid feeding of the material and a delivery of particles in free flight into the path of movement of the impact members l0.

While a wide variety of relative speeds and dimensions may be employed, it will be understood that the members I0 are so spaced about the rotor in relation to the speed of movement of the belt and the speed of movement of the rotor as to give the particles flung into the path of the impact members ID by the belt enough time to get completely into the path of the impact members. The result is a full face crushing impact which drives the broken particles centrifugally in the direction of the arrow of Figure 1. This is in contrast to a glancing impact or an impact concentrated at the outer edge of the members I0, which would result if the members in were too closely spaced, or if the relative speeds of conveyor and impact member were not such as to permit the particles to get fully within the path of the impact members In before being struck.

In other words, the linear speed of the conveyor or of the particles delivered from the conveyor must be sufficiently high in relation to the spacing of the members l0 and the speed of rotation of the rotor to permit successive areas or increments of the material to be crushed to penetrate fully into the path of movement of the members 10 for a full face crushing impact. It is as if a stream of material were being projected generally toward the axis of rotation oi. the impact member, the lengths of this stream being successfully clipped off and smashed out of the way by the movement of the members Ill in the course of the rotation of the rotor. I

I claim:

In an impact crusher and feeding means therefor, a rotor and means for rotating it about a generally horizontal axis, said rotor including a hub and a plurality of impact members outwardly 1 extending therefrom, and feeding means for said rotor including a belt and a plurality of pulleys about which said belt passes, said pulleys being mounted for rotation about horizontal axes, one

of said pulleys being located adjacent the periphery of movement of the impact members of said rotor, and means for simultaneously driving .said rotor and said belt at speeds adapted for projection of material from said belt directly into the path of movement of said impact members.

whereby such particles are positioned to receive a full face crushing impact, the impact member spacing being correlated with the speed of the feed conveyor.

EDGAR B. SYMONS. 

